WO2019102532A1 - Compresseur et dispositif à cycle de réfrigération - Google Patents

Compresseur et dispositif à cycle de réfrigération Download PDF

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Publication number
WO2019102532A1
WO2019102532A1 PCT/JP2017/041917 JP2017041917W WO2019102532A1 WO 2019102532 A1 WO2019102532 A1 WO 2019102532A1 JP 2017041917 W JP2017041917 W JP 2017041917W WO 2019102532 A1 WO2019102532 A1 WO 2019102532A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
compressor
closed container
oil
compressor according
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PCT/JP2017/041917
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English (en)
Japanese (ja)
Inventor
修平 小山
鉄郎 平見
裕貴 田村
Original Assignee
三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2017/041917 priority Critical patent/WO2019102532A1/fr
Publication of WO2019102532A1 publication Critical patent/WO2019102532A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle

Definitions

  • the present invention relates to a compressor and a refrigeration cycle apparatus using a refrigerant and refrigeration oil.
  • a compressor includes a compression mechanism portion for compressing a refrigerant and a drive mechanism portion for driving the compression mechanism portion in a closed container, and refrigeration oil for lubricating the compression mechanism portion is stored in the lower portion of the closed container. It is done.
  • the compressor is required to shift to a natural refrigerant having a low global warming potential (GWP).
  • GWP global warming potential
  • Propane hereinafter referred to as "R290”
  • R290 polyalkylene glycol
  • PAG polyalkylene glycol
  • refrigerator oil having good compatibility with R290.
  • PAG oil has a higher oxygen content in chemical constitution and is easier to conduct electricity than the other synthetic oils, polyol ester (POE) oil and polyvinyl ether (PVE) oil.
  • a sealed terminal is attached to the sealed container in order to energize the drive mechanism, and the insulating property needs to be maintained in the sealed terminal.
  • the sealing terminal is attached to the upper lid of the hermetic container, and a drive mechanism portion connected to the sealing terminal is disposed in the upper part in the hermetic container.
  • the sealing terminal may be disposed on the side wall of the sealed container. In such a configuration, when the refrigerant and the refrigerator oil are stored in the sealed container, the sealed terminals may be immersed, and the terminals may be shorted by the refrigerator oil.
  • the present invention has been made to solve the problems as described above, and an object of the present invention is to provide a compressor and a refrigeration cycle apparatus in which the insulation property of the sealing terminal is secured.
  • the compressor according to the present invention is provided with a space therein, a closed container storing polyalkylene glycol oil as refrigeration oil, a suction pipe provided in the closed container, and allowing refrigerant to flow into the low pressure space of the closed container
  • a compression mechanism disposed in the closed container, sucking in the refrigerant from the low pressure space and compressing and discharging the refrigerant into the high pressure space
  • a drive mechanism disposed in the closed container to drive the compression mechanism.
  • a sealing terminal provided on the side wall of the closed container above the suction pipe and electrically connected to the drive mechanism.
  • the sealing terminal by disposing the sealing terminal on the side wall of the hermetic container, the refrigerant and PAG oil stored in the hermetic container flow to the suction pipe, so that the sealing terminal is immersed in the PAG oil. This can be avoided, and the insulation of the sealed terminal can be secured.
  • Embodiment 1 is a cross-sectional view of a compressor according to Embodiment 1 of the present invention. It is the schematic of the refrigerant circuit of the refrigerating-cycle apparatus which concerns on Embodiment 1 of this invention. It is a schematic diagram which shows the example of a connection with the evaporator of the compressor based on Embodiment 1 of this invention. It is a schematic diagram which shows the example of another connection with the evaporator of the compressor based on Embodiment 1 of this invention. It is a schematic diagram which shows the other structural example of the suction pipe which concerns on Embodiment 1 of this invention. It is a figure which shows the relationship of the density and temperature of R290 liquid refrigerant.
  • FIG. 1 is a cross-sectional view of a compressor according to Embodiment 1 of the present invention.
  • the compressor 100 is connected to the refrigerant circuit 80 (see FIG. 2), and circulates the refrigerant through the refrigerant circuit 80.
  • the compressor 100 sucks and compresses a refrigerant, and discharges the refrigerant in a high temperature and high pressure state.
  • propane (R290) alone or a mixed refrigerant containing R290 is used as the refrigerant.
  • the compressor 100 is a vertical compressor installed so that the axial direction is the vertical direction (the arrow Z direction).
  • the compressor 100 includes a sealed container 1 as an outer shell, a compression mechanism 2 for compressing a refrigerant, a drive mechanism 3 for driving the compression mechanism 2, and a sealed terminal 5 electrically connected to the drive mechanism 3. And have.
  • the closed container 1 includes a cylindrical body 11 and a circular upper lid 12 and a lower lid 13.
  • the upper lid 12 is joined to the upper opening of the trunk 11, and the lower lid 13 is joined to the lower opening of the trunk 11. That is, the side wall of the closed container 1 is the trunk portion 11.
  • the lower lid portion 13 of the sealed container 1 is fixed to the pedestal 4.
  • an oil reservoir 13a is provided in the lower part of the closed container 1, and refrigeration oil for lubricating and cooling the compression mechanism portion 2 is stored.
  • a polyalkylene glycol (PAG) oil suitable for R290 refrigerant is used as the refrigerating machine oil.
  • a portion of the refrigeration oil circulates through the refrigerant circuit 80 together with the refrigerant. Further, a part of the refrigerant is dissolved in the refrigerating machine oil stored in the compressor 100.
  • the compressor 100 also includes a suction pipe 14 and a discharge pipe 15.
  • the suction pipe 14 is a straight pipe, and is fixed to the trunk portion 11 of the sealed container 1 by press fitting or the like.
  • the suction pipe 14 is disposed in the horizontal direction (arrow X direction) so that the heights of both ends are equal.
  • the suction pipe 14 is for causing a low pressure refrigerant returning to the compressor 100 in the refrigerant circuit 80 to flow into the closed container 1.
  • the discharge pipe 15 is fixed to the upper lid 12 of the sealed container 1 by press fitting or the like.
  • the discharge pipe 15 causes the high-pressure refrigerant compressed by the compression mechanism 2 to flow out of the closed container 1.
  • the sealing terminal 5 is fixed to the body portion 11 of the sealed container 1.
  • the sealing terminal 5 is connected to the drive mechanism unit 3 through the lead wire 54 and supplies power to the drive mechanism unit 3 from an external power supply.
  • the sealing terminal 5 has a plurality of terminal pins 51 provided for each phase, an insulating portion 52 sealing the terminal pins 51, and a metal base 53 sealing the insulating portion 52.
  • the insulating unit 52 is made of an insulating material such as glass, for example.
  • the metal base 53 is joined to a hole provided in the body 11 by, for example, projection welding.
  • the compression mechanism portion 2 is installed at the upper portion in the closed container 1, sucks and compresses the refrigerant from the low pressure space S1 formed below, and discharges it to the high pressure space S2 formed above.
  • the compression mechanism 2 includes a fixed scroll 21, a swing scroll 22 disposed below the fixed scroll 21, and a frame 23 fixed to the closed container 1.
  • the fixed scroll 21 has a first base plate 21a and a first scroll 21b.
  • the first base plate 21 a is fixed to the frame 23 by a bolt or the like.
  • the first spiral body 21b is a spiral protrusion provided on one surface of the first base plate 21a.
  • a discharge port 21c is formed at the center of the first base plate 21a.
  • the oscillating scroll 22 has a second base plate 22a and a second scroll 22b.
  • a cylindrical swing bearing portion 22c is formed substantially at the center of the surface (hereinafter referred to as a thrust surface) opposed to the frame 23 in the second base plate 22a.
  • an annular Oldham ring 27 is interposed between the thrust surface and the frame 23.
  • the second spiral body 22b is a spiral protrusion formed on the rear surface of the thrust surface in the second base plate 22a.
  • the rocking scroll 22 and the fixed scroll 21 are combined with each other such that the second scroll 22b and the first scroll 21b mesh with each other, and are mounted by the frame 23 in the closed container 1.
  • a compression chamber 26 is formed whose volume decreases in the radial direction perpendicular to the axial direction (the direction of the arrow Z) toward the axis of the sealed container 1.
  • the frame 23 supports the fixed scroll 21 and the oscillating scroll 22.
  • the outer peripheral surface of the frame 23 is fixed to the inner peripheral surface of the sealed container 1 by, for example, shrink fitting or welding.
  • a main bearing portion 23a penetrating vertically is formed at the center of the frame 23, a main bearing portion 23a penetrating vertically is formed.
  • the main bearing portion 23 a rotatably supports the crankshaft 33 of the drive mechanism portion 3.
  • the compression mechanism unit 2 includes a discharge valve 24 and a valve presser 25.
  • the discharge valve 24 is provided on the high pressure space S2 side so as to close the opening of the discharge port 21c of the fixed scroll 21.
  • the valve presser 25 is made of, for example, a leaf spring.
  • the valve presser 25 is disposed above the discharge valve 24 and limits the lift amount of the discharge valve 24.
  • the drive mechanism unit 3 is disposed below the compression mechanism unit 2 in the closed container 1 and drives the swing scroll 22 of the compression mechanism unit 2.
  • the drive mechanism 3 is at least fixed to a cylindrical stator 31 fixed inside the sealed container 1, a rotor 32 rotatably installed on the inner peripheral surface side of the stator 31, and a center of the rotor 32. It has a crankshaft 33 as a shaft.
  • the outer peripheral surface of the stator 31 is fixed to the inner surface of the sealed container 1 by shrink fitting or the like.
  • the rotor 32 is held with a gap from the stator 31.
  • the rotor 32 has a permanent magnet (not shown) inside, and is rotationally driven by energization of the stator 31 to rotate the crankshaft 33.
  • the crankshaft 33 rotates with the rotation of the rotor 32 attached to the outer periphery, and rotationally drives the oscillating scroll 22.
  • a rocking shaft 33a is formed at an upper end portion of the crankshaft 33, and a bush 34 is attached to the rocking shaft 33a.
  • the rocking shaft 33a on which the bush 34 is mounted is fitted to the rocking bearing portion 22c of the rocking scroll 22 with a gap.
  • an oil circuit 33 b is formed inside the crankshaft 33, and refrigeration oil is supplied to the compression mechanism 2 through the oil circuit 33 b.
  • the compressor 100 also includes a sub-frame 6 that supports the lower side of the crankshaft 33, and an oil pump 7 that pumps up refrigeration oil.
  • the sub-frame 6 is fixed to the inner peripheral surface of the closed container 1 below the drive mechanism 3.
  • a sub-bearing portion 6 a penetrating vertically, and the sub-bearing portion 6 a rotatably supports the crankshaft 33.
  • the crankshaft 33 is pivotally supported on the upper side by the frame 23 and is pivotally supported on the lower side by the sub-frame 6, and is disposed in the axial direction (the arrow Z direction) of the sealed container 1.
  • the oil pump 7 is, for example, a positive displacement pump, and is provided below the crankshaft 33.
  • the oil pump 7 pumps up the refrigerating machine oil of the oil reservoir 13a as the crankshaft 33 rotates, and supplies it to the rocking bearing 22c, the main bearing 23a, etc. through the oil circuit 33b of the crankshaft 33.
  • the refrigerant is taken into the compression chamber 26 from the low pressure space S1.
  • the volume of the compression chamber 26 decreases while moving from the outer peripheral portion of the compression mechanism portion 2 to the center along with the swinging motion of the swing scroll 22, so the refrigerant taken into the compression chamber 26 is compressed.
  • the compressed refrigerant is discharged from the discharge port 21 c of the fixed scroll 21 against the elastic force of the valve retainer 25 into the high pressure space S 2, and discharged out of the closed container 1 through the discharge pipe 15.
  • FIG. 2 is a schematic view of a refrigerant circuit of the refrigeration cycle apparatus according to Embodiment 1 of the present invention.
  • the refrigeration cycle apparatus 101 is, for example, a refrigerator, an air conditioner, a water heater, or the like provided with a refrigerant circuit 80.
  • the refrigeration cycle apparatus 101 includes the compressor 100, the condenser 81, the dryer 82, the pressure reducing device 83, and the evaporator 84, which are described above. Are connected to form the refrigerant circuit 80.
  • the case where the refrigeration cycle apparatus 101 is a refrigerator will be described as an example.
  • the evaporator 84 is installed in a freezer compartment, and the compressor 100, the condenser 81, the dryer 82 and the decompression device 83 are installed outdoors.
  • the condenser 81 is provided on the discharge side of the compressor 100, and exchanges heat between the high pressure refrigerant discharged from the compressor 100 and the outside air.
  • the dryer 82 is provided between the condenser 81 and the pressure reducing device 83 to remove moisture in the refrigerant.
  • the decompression device 83 is provided between the dryer 82 and the evaporator 84, and decompresses and expands the refrigerant.
  • the evaporator 84 is provided on the suction side of the compressor 100, and exchanges heat between the refrigerant having passed through the pressure reducing device 83 and the room air in the freezer compartment.
  • the high-temperature, high-pressure gas refrigerant discharged from the compressor 100 flows into the condenser 81, and is condensed and liquefied while radiating outside air in the condenser 81.
  • the refrigerant flowing out of the condenser 81 passes through the dryer 82, the water is removed and flows to the decompression device 83. Thereafter, the refrigerant is decompressed and expanded by the decompression device 83 and flows into the evaporator 84.
  • the refrigerant flowing into the evaporator 84 evaporates and evaporates while absorbing heat from room air in the evaporator 84. At this time, the room air of the freezer compartment is cooled.
  • the refrigerant flowing out of the evaporator 84 is again sucked into the closed container 1 from the suction pipe 14 of the compressor 100. While the compressor 100 is operating, the circulation of the refrigerant described above is repeated.
  • a part of the refrigerant in the evaporator 84 may return to the compressor 100 with the liquid remaining in the liquid state.
  • the level of the liquid level of the refrigerant stored in the closed container 1 rises.
  • the compressor 100 is stopped, liquid refrigerant flows from the evaporator 84 into the closed container 1 through the suction pipe 14, and refrigerant stagnation accumulated in the closed container 1 occurs.
  • the connection terminal of the three-phase motor and the terminal pin 51 of the sealing terminal 5 are provided for each phase.
  • the distance between the terminal pins 51 is shorter than the distance between the connection terminals of the three-phase motor. That is, the distance between the terminal pins 51 is the shortest distance between the terminals in the compressor 100.
  • the PAG oil is filled between the terminal pins 51.
  • the volume resistivity of PAG oil is smaller than that of air and refrigerant, and as a result, the resistance between the terminal pins 51 may be reduced, which may result in insulation failure of the sealed terminal 5.
  • the volume resistivity of R290 refrigerant is on the order of 10 9 ( ⁇ m) and the volume resistivity of PAG oil is on the order of 10 7 ( ⁇ m).
  • the volume resistivity of POE oil or PVE oil used in a compressor using R410A refrigerant is on the order of 10 11 to 10 12 ( ⁇ m). That is, PAG oil used as refrigeration oil is easier to conduct electricity than POE oil and PVE oil.
  • the sealing terminal 5 is located above the suction pipe 14. That is, the height Lt from the lower end of the closed container 1 to the sealed terminal 5 is higher than the height Ls from the lower end of the closed container 1 to the center of the suction pipe 14.
  • the suction pipe 14 of the compressor 100 is provided in the horizontal direction (the arrow X direction). Therefore, the mixed liquid easily flows from the suction pipe 14, the height of the liquid surface is suppressed to the height Ls or less of the suction pipe 14, and the insulation of the sealing terminal 5 is secured. Therefore, the abnormal stop of the compressor 100 can be prevented.
  • FIG. 3 is a schematic view showing an example of connection of the compressor according to Embodiment 1 of the present invention with the evaporator.
  • the evaporator 84 is disposed below the suction pipe 14 of the compressor 100.
  • the mixed liquid becomes the suction pipe 14 and the refrigerant by gravity. It flows out to the evaporator 84 through the pipe 85. Therefore, the height of the liquid surface of the mixed liquid in the sealed container 1 is suppressed to the height Ls or less of the suction pipe 14 and the insulation is well maintained at the sealing terminal 5 provided above the suction pipe 14 .
  • FIG. 4 is a schematic view showing another connection example of the compressor according to Embodiment 1 of the present invention with the evaporator.
  • the evaporator 84 is disposed above the suction pipe 14 of the compressor 100.
  • the refrigerant pipe 85 connecting the suction pipe 14 and the evaporator 84 has an inverted U-shaped trap 86, and the top 86 a of the trap 86 is located above the evaporator 84.
  • the trap 86 prevents the liquid refrigerant of the evaporator 84 from flowing down to the compressor 100 while the compressor 100 is stopped. can do. Therefore, the increase of the liquid mixture in the closed container 1 is suppressed.
  • FIG. 5 is a schematic view showing another configuration example of the suction pipe according to Embodiment 1 of the present invention.
  • the suction pipe 114 has an L shape in which a pipe portion 114 a connected to the refrigerant pipe 85 is bent upward.
  • a part of the trap 86 is formed by the suction pipe 114, and the shape of the refrigerant pipe 85 can be simplified.
  • an inverted U-shaped trap 86 can be connected directly to the upwardly extending piping portion 114a.
  • the height from the lower end of the closed container 1 to the connection center of the closed container 1 and the suction pipe 114 is defined as the height Ls of the suction pipe 114.
  • the mixed solution may be separated into two layers, the refrigerant rich layer and the oil rich layer.
  • the sealing terminal 5 is immersed in the mixed liquid when the mixed liquid is separated into two layers, if the oil rich layer is accumulated upward, the insulation property is lowered compared to the case where the refrigerant rich layer is accumulated upward Do.
  • the refrigerant is R290 alone, since the density of the refrigerant is lower than that of PAG oil, the refrigerant rich layer having a high volume resistivity is accumulated upward. Therefore, even when the sealing terminal 5 is immersed in the mixed liquid, the decrease in the insulation property is suppressed.
  • FIG. 6 is a diagram showing the relationship between the density and temperature of R290 liquid refrigerant.
  • the horizontal axis represents temperature (° C.)
  • the vertical axis represents density (kg / m 3 ).
  • the dashed-dotted line in FIG. 6 represents the density of PAG oil
  • the solid line represents the density of R290 alone in the liquid state.
  • the density of R290 alone changes with temperature, and in the temperature range of ⁇ 50 to 90 ° C., the higher the temperature, the lower the density, which is 370 to 590 (kg / m 3 ).
  • the change in density of PAG oil with temperature is slower than the change in density of R290 alone, and is about 1000 (kg / m 3 ) in the temperature range of -30 to 90 ° C.
  • the PAG oil has a lower density at higher temperatures in the range of -30 to 90 ° C., and is 960 to 1020 (kg / m 3 ).
  • the type and mixing ratio of the refrigerant to be mixed in R290 are set such that the density of the mixed refrigerant is lower than the density of the PAG oil.
  • the temperature in the closed vessel 1 changes from -50.degree. C. to 90.degree.
  • the mixed refrigerant containing R290 has a density of 950 (kg / m 3 ) or less, which is lighter than the density of PAG oil.
  • PAG oil which easily conducts electricity in the mixed liquid of PAG oil and the refrigerant can be distributed to the lower part of the closed container 1, and the decrease in insulation of the sealed terminal 5 can be further suppressed.
  • the refrigerant is not limited to R290 alone or a mixed refrigerant containing R290, and may have a density lower than that of PAG oil and a volume resistivity higher than that of PAG oil.
  • the refrigeration cycle apparatus 101 operates normally when the saturated water content is 20000 (ppm) or less. For this reason, also in the case of R290 alone or a mixed refrigerant containing R290, the saturated water content is preferably 20000 (ppm) or less.
  • the refrigerant is a single propane refrigerant or a mixed refrigerant containing propane.
  • R290 refrigerant which is a natural refrigerant
  • PAG oil having good compatibility with R290 refrigerant
  • stagnation of refrigeration oil to the refrigerant circuit 80 can be suppressed by this, the flow of the refrigerant is not disturbed, and the efficient refrigeration cycle apparatus 101 can be provided.
  • the density of the refrigerant is less than the density of PAG oil.
  • PAG oil which easily conducts electricity can be distributed in the lower layer of the mixed liquid, so even if the mixed liquid is stagnated in the closed container 1 as in refrigerant bed, for example, the sealing terminal 5 is contained in the PAG oil. It is suppressed that it is immersed, and the insulation fall is suppressed.
  • the density of the refrigerant is 950 (kg / m 3 ) or less.
  • the density of the refrigerant is maintained to be smaller than the density of the PAG oil while the temperature in the closed container 1 changes. Therefore, the type of the single refrigerant to be used, or the type and the mixing ratio of the mixed refrigerant can be selected based on the density, as long as the effect of suppressing the decrease in the insulating property can be obtained, and the versatility can be enhanced.
  • the volume resistivity of the refrigerant is higher than the volume resistivity of PAG oil.
  • a PAG that easily conducts electricity as compared to a refrigeration oil such as POE oil and PVE oil is used, it is possible to suppress the decrease in insulation of the mixed liquid by the refrigerant. Therefore, the type of single refrigerant to be used, or the type and mixing ratio of mixed refrigerant can be selected based on the volume resistivity within the range in which the effect of suppressing the decrease in insulation can be obtained, and the versatility can be enhanced.
  • the saturated water content of PAG oil is 20000 (ppm) or less.
  • R290 has a smaller density than R410A
  • the closed container is thick, and the cost is greatly increased when the closed container 1 is enlarged.
  • the compression mechanism portion 2 includes the fixed scroll 21 having the first spiral body 21b and the swing scroll 22 having the second spiral body 22b
  • the thickness of the closed container 1 is thin, The refrigeration capacity can be secured while suppressing the increase.
  • the type of compressor 100 is not limited to the scroll compressor.
  • the thickness of the closed vessel 1 can be reduced. Furthermore, by providing the sealing terminal 5 on the side wall of the sealed container 1, the sealed terminal 5 can be disposed on the low pressure side of the sealed container 1, and the sealing performance of the sealed container 1 is improved.
  • the refrigeration cycle apparatus 101 includes the compressor 100 and the dryer 82 that adsorbs water.
  • the water content of the refrigerant of the refrigerant circuit 80 can be reduced, and clogging of the refrigerant pipe 85 at low temperatures can be prevented.
  • the reduction of the moisture content of the refrigerant can suppress the decrease in the insulation due to the moisture of the refrigeration oil.
  • the refrigerant circuit 80 includes the compressor 100, the condenser 81, the pressure reducing device 83, and the evaporator 84 connected by the refrigerant pipe 85.
  • a trap 86 is formed between the compressor 100 and the evaporator 84.
  • the top 86a of the refrigerant pipe 85 is located above the evaporator 84.
  • compressor 200 includes a detection sensor for detecting the state of refrigerant stagnation, heater 92, and control unit 201, and the insulating property of sealing terminal 5 even when refrigerant stagnation or the like occurs. Is configured to secure the.
  • symbol is attached
  • FIG. 7 is a cross-sectional view showing a configuration example of a compressor according to Embodiment 2 of the present invention.
  • the detection sensor is a temperature sensor 91 that detects the temperature of the liquid mixture stored in the sealed container 1.
  • the temperature sensor 91 is disposed on the lower surface of the closed container 1.
  • the temperature sensor 91 may be installed on the inner surface of the closed container 1 so as to directly detect the temperature of the mixed liquid.
  • the heater 92 heats the liquid mixture stored in the closed container 1.
  • the heater 92 is attached along the outer periphery of the lower part of the closed container 1.
  • the heater 92 generates heat by energization, and prevents refrigerant stagnation even when the operation of the compressor 200 is stopped.
  • the control unit 201 includes, for example, a microcomputer, and controls the energization of the heater 92 based on the detection value of the temperature sensor 91. Specifically, when the detection value of the temperature sensor 91 is equal to the saturation temperature, the control unit 201 determines that the refrigerant is lying down and controls the heater 92 to be energized.
  • the compressor 200 includes the control unit 201 that controls the heater 92 so as to heat the liquid mixture when the stagnation of the refrigerant is detected by the detection sensor.
  • This makes it possible to determine the state of the mixed liquid in the closed container 1 such as refrigerant stagnation, and when the liquid refrigerant staying in the closed container 1 increases, the mixed liquid is heated by the heater 92 to It can be evaporated and expelled out of the closed container 1. Therefore, the stagnant liquid refrigerant can be reduced to suppress the rise of the liquid level of the mixed liquid, and the insulation of the sealed terminal 5 can be secured.
  • a failure or the like of the compressor 200 caused by a sudden expansion of the refrigerant at the time of restarting the compressor 200 can be avoided, and the reliability of the compressor 200 is further enhanced.
  • the detection sensor is a temperature sensor 91 that detects the temperature of the mixed liquid. As a result, it is possible to determine whether the refrigerant is stagnating with a simple configuration and to suppress the rise of the liquid surface of the mixed liquid by the heating of the heater 92. As a result, the insulation of the sealing terminal 5 is secured.
  • the same effect can be obtained by the energization control.
  • the stator 31 by energizing the stator 31 so as not to generate torque with the rotor 32, the stator 31 may be heated and the liquid refrigerant may be expelled from the mixed liquid.
  • FIG. 8 is a cross-sectional view showing a configuration example of a compressor according to Embodiment 3 of the present invention.
  • the state of the mixed liquid is determined by detecting the temperature of the mixed liquid by the temperature sensor 91, but the detection sensor is not particularly limited.
  • the detection sensor is not particularly limited.
  • a case where a capacitance sensor 93 is used as a detection sensor will be described.
  • the same components as those of the compressor 200 according to the second embodiment are designated by the same reference numerals and their description will be omitted, and different configurations will be described.
  • the compressor 300 includes a heater 92, a capacitance sensor 93, and a control unit 301.
  • the capacitance sensor 93 includes, for example, an electrode pair and detects the capacitance of the liquid mixture stored in the closed container 1.
  • the capacitance sensor 93 is disposed in the lower part of the closed container 1.
  • the control unit 301 is, for example, a microcomputer or the like, and controls the energization of the heater 92 based on the capacitance of the liquid mixture detected by the capacitance sensor 93.
  • control unit 301 calculates the concentration of refrigerating machine oil based on the capacitance of the mixed liquid, and determines that the refrigerant is stagnating when the calculated oil concentration is less than or equal to the set concentration, and the heater Control to energize 92. According to such a configuration, when the refrigerant stagnation occurs and the refrigerant concentration in the mixed solution becomes high, the stored mixed solution can be heated to expel the liquid refrigerant from the mixed solution.
  • the compressor 300 can suppress the rise of the liquid surface of the mixed liquid even when refrigerant stagnation occurs.
  • the detection sensor is a capacitance sensor 93 that detects the capacitance of the liquid mixture.
  • FIG. 9 is a cross-sectional view of a compressor according to Embodiment 4 of the present invention.
  • FIG. 10 is an explanatory view showing an AA cross section of the sealed container 1 and the sealed terminal 5 of FIG.
  • the compressor 400 is installed such that the axial direction C of the closed container 1 is inclined with respect to the vertical direction (the arrow Z direction).
  • the same components as those of the compressor 100 of the first embodiment are designated by the same reference numerals and their description is omitted, and only different components will be described.
  • the inclined pedestal 404 is, for example, a pedestal of the compressor 100 when the compressor 100 is installed in a vehicle or the like, and is attached to the horizontal direction (the arrow X direction). It has a surface 404a.
  • the closed container 1 is attached to the inclined pedestal 404 such that a part of the body 11 is supported by the attachment surface 404a.
  • the sealing terminal 5 and the suction pipe 14 are installed in the sealed container 1 so that the height Lt of the sealing terminal 5 in the axial direction C is higher than the height Ls of the suction pipe 14. Further, the sealed container 1 is attached to the inclined pedestal 404 so that the sealed terminal 5 is positioned above the suction pipe 14 also in the vertical direction (the arrow Z direction). That is, in a state in which the sealed container 1 is attached to the inclined pedestal 404, the height Lt1 in the vertical direction (arrow Z direction) from the lower end of the sealed container 1 to the sealed terminal 5 It is arranged to be higher than the height Ls1 to the center.
  • the closed container 1 may be attached to the inclined pedestal 404 so that the sealing terminal 5 is positioned at the uppermost position in the radial cross section of the body 11.
  • the distance between the sealing terminal 5 and the suction pipe 14 in the vertical direction (the direction of the arrow Z) can be easily secured to a certain value or more.
  • the mixed liquid can be made to flow out from the suction pipe 14 in a state in which the distance between the sealing terminal 5 and the liquid surface is secured.
  • the sealing terminal 5 can be disposed above the suction pipe 14, and mixing is performed via the suction pipe 14 as in the case of the first embodiment.
  • the liquid can be drained to suppress the rise of the liquid level, and the insulation of the sealing terminal 5 can be secured.
  • the sealed container 1 is disposed to be inclined with respect to the vertical direction (the arrow Z direction), and the sealed terminal 5 is disposed above the suction pipe 14 in the vertical direction also in the sealed container 1 which is disposed to be inclined. To position.
  • the installation height of the compressor 400 can be lowered, and the compressor 400 can be installed at a position where the height is limited.
  • the refrigerant and the refrigerator oil can be made to flow out from the lower suction pipe 14 and the liquid surface rises
  • the insulation of the sealing terminal 5 can be secured.
  • an accumulator may be provided between the evaporator 84 and the compressor 100 to reduce the amount of liquid refrigerant returned to the compressor 100.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Abstract

Selon l'invention, un compresseur comprend : un récipient fermé hermétiquement qui est pourvu à l'intérieur d'un espace de stockage d'huile de polyalkylène glycol, servant d'huile de machine de réfrigération ; un tuyau d'aspiration qui est disposé dans le récipient fermé hermétiquement pour faire s'écouler un réfrigérant dans un espace basse pression dans le récipient fermé hermétiquement ; une unité de mécanisme de compression qui est logée dans le récipient fermé hermétiquement, et qui aspire le réfrigérant à partir de l'espace basse pression, et comprime et refoule celui-ci vers un espace haute pression ; une unité de mécanisme d'entraînement qui est logée dans le récipient fermé hermétiquement pour entraîner l'unité de mécanisme de compression ; et une borne étanche qui est disposée sur une paroi latérale du récipient fermé hermétiquement, plus haut que le tuyau d'aspiration, et qui est connectée électriquement à l'unité de mécanisme d'entraînement.
PCT/JP2017/041917 2017-11-22 2017-11-22 Compresseur et dispositif à cycle de réfrigération WO2019102532A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020080064A1 (fr) * 2018-10-18 2020-04-23 株式会社神戸製鋼所 Appareil de réfrigération

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001124420A (ja) * 1999-10-25 2001-05-11 Mitsubishi Electric Corp 冷凍空調装置および冷凍空調装置の更新方法
JP2012031239A (ja) * 2010-07-29 2012-02-16 Hitachi Appliances Inc 冷凍空調用圧縮機及び冷凍空調装置
WO2013058265A1 (fr) * 2011-10-21 2013-04-25 ダイキン工業株式会社 Appareil de commande de compresseur

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001124420A (ja) * 1999-10-25 2001-05-11 Mitsubishi Electric Corp 冷凍空調装置および冷凍空調装置の更新方法
JP2012031239A (ja) * 2010-07-29 2012-02-16 Hitachi Appliances Inc 冷凍空調用圧縮機及び冷凍空調装置
WO2013058265A1 (fr) * 2011-10-21 2013-04-25 ダイキン工業株式会社 Appareil de commande de compresseur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020080064A1 (fr) * 2018-10-18 2020-04-23 株式会社神戸製鋼所 Appareil de réfrigération

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